refactor(dialogs): unify text input contract

lib/screens/settings/settings_utils.dart

@@ -364,38 +364,6 @@ void _showColorInputDialogTV({
   );
 }
 
-/// Shows a text input dialog with regex validation and reset-to-default support.
-/// Plain single-field text input dialog (dpad/TV friendly via
-/// [FocusableTextField]); the free-form sibling of [showRegexInputDialog].
-void showTextInputDialog({
-  required BuildContext context,
-  required String title,
-  required String labelText,
-  required String currentValue,
-  required Future<void> Function(String value) onSave,
-}) {
-  final controller = TextEditingController(text: currentValue);
-
-  _showSettingsInputDialog(
-    context: context,
-    title: title,
-    contentBuilder: (_, _, _, saveFocusNode) {
-      return FocusableTextField(
-        controller: controller,
-        decoration: InputDecoration(labelText: labelText),
-        autofocus: true,
-        textInputAction: TextInputAction.done,
-        onEditingComplete: () => saveFocusNode.requestFocus(),
-      );
-    },
-    onSave: (_) async {
-      await onSave(controller.text.trim());
-      return true;
-    },
-    onDispose: controller.dispose,
-  );
-}
-
 void showRegexInputDialog({
   required BuildContext context,
   required String title,